Hi! On 14:01 Fri 17 Apr , Devesh Sharma wrote: > Hi michi, > Its is using a TCP/IP protocol, program is Intel's MPI benchmark IMB, > and CPU is surely not a bottelneck because its Quad core Quad socket > machine with 64GB of physical mem. its a proprietary device for > Systems Area Networks used for cluster computing. But the main problem > that I have observed is, my device do not get any packets to post > during this data size thats why I am trying to look beyond my device > related functions. It seems like this benchmark is quite latency sensitive. Is the benchmark TCP based? If yes, you can try (as root): echo "1" > /proc/sys/net/ipv4/tcp_low_latency Is there any packet loss on the link? What does "ping -f" and "ping -f -s 4096" say? How much does the latency increase if you send bigger packets? Is there a "magic value" which causes a "sudden increase" (e.g. 4051 is much slower than 4050)? Does this problem persist if the kernel is compiled without smp support (just for diagnosis)? -Michi -- programing a layer 3+4 network protocol for mesh networks see http://michaelblizek.twilightparadox.com -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
